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BS EN ISO 18369-4:2017:2018 Edition

BS EN ISO 18369-4:2017:2018 Edition

$189.07

Ophthalmic optics. Contact lenses – Physicochemical properties of contact lens materials

Published By Publication Date Number of Pages
BSI 2018 46
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This document specifies the methods of testing the physicochemical properties of contact lens materials. These are extraction, rigid lens flexure and breakage, oxygen permeability, refractive index and water content.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
4 Physicochemical properties of contact lenses
4.1 Repeatability, test methods and units of measure
10 4.2 Extractables
4.2.1 General
4.2.2 Principle
4.2.3 Apparatus
11 4.2.4 Reagents
12 4.2.5 Test samples
4.2.6 Test procedure
4.2.7 Calculation of results
13 4.2.8 Test report
4.3 Rigid lens flexural deformation and rupture
4.3.1 Principle
4.3.2 Sampling
14 4.3.3 Preparation of samples
4.3.4 Apparatus
16 4.3.5 Procedure
4.3.6 Test result
17 4.4 Oxygen permeability
4.4.1 General
4.4.2 Common elements of the methods
18 4.4.3 Polarographic method
26 4.4.4 Normalization of the corrected oxygen permeability using reference lenses
27 4.4.5 Test report
4.5 Refractive index
4.5.1 General
4.5.2 Abbe refractometer
28 4.5.3 Test samples
4.5.4 Procedure
29 4.5.5 Expression of test results
4.5.6 Test report
30 4.6 Water content
4.6.1 General
4.6.2 Gravimetric determination of water content/absorption by loss on drying using an oven
32 4.6.3 Test report
5 Test report
33 Annex A (informative) Determination of oxygen permeability using the coulometric method
40 Annex B (informative) Determination of water content by refractive index
41 Annex C (informative) Calculation of oxygen permeability of hydrogel contact lenses based on water content
42 Annex D (informative) Measurement of refractive index using a prism coupling device
44 Bibliography

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BS EN ISO 18369-4:2017
$189.07